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Schedule of Effect of Derivatives Instruments on Consolidated Statement of Earnings (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Amount of gain (loss) recognized in other comprehensive loss on derivative $ (0.6) $ (1.4)
Amount of gain (loss) reclassified from accumulated other comprehensive loss into earnings 1.0 0.2
Foreign Currency Contracts    
Derivative [Line Items]    
Amount of gain (loss) recognized in other comprehensive loss on derivative (1.1) (3.8)
Foreign Currency Contracts | Cost Of Products Sold    
Derivative [Line Items]    
Amount of gain (loss) reclassified from accumulated other comprehensive loss into earnings 0.4 (1.4)
Commodities Contracts    
Derivative [Line Items]    
Amount of gain (loss) recognized in other comprehensive loss on derivative 0.5 2.4
Commodities Contracts | Cost Of Products Sold    
Derivative [Line Items]    
Amount of gain (loss) reclassified from accumulated other comprehensive loss into earnings $ 0.6 $ 1.6